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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bf878a7869a90d3c96b79d994dcfa692fbc4f49f45f904e840bcf42fc79970c' 
  AND token = 'daincv1b9jjqJ3uGCYuWasoJwNhRuKm11wH+19iHMCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}