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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ef1cabae5b4ba0faf7f23597424698b88f458a8161591454b5c0e5b85141f48' 
  AND token = 'FciD1V3jpZDDcf7C1nDviTm3Oan+HLnhTVz21KKnGuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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