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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4214e021cdd4d9af4123ad34ea57546558547a3de26107f35343147210fcd3d4' 
  AND token = '4bo+iKKnpOirkNwcA0G4f9m6SA8x1ajNZbjbcWwzxK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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