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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f92f746f30333346c3b2091d3851d5d424aad17baf8ec26fc426d6a2e39c631' 
  AND token = 'XVXWZro1vCsk+GFWfUdWYNF4gx3dTHNKoayd2MFOOt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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