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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '744aa5869a009cbb988d7a6035619a4d1c7b8581c13b5dbb3adaa946945054a7' 
  AND token = 'd74CNNPPATcdTQbdrPUe1QshApOhnH3kJ9h6Efkki4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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