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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd343db348626ea44f236cfda0b2ded12e5aec8e565ee7b10990cc099543ab088' 
  AND token = 'e9aXXrYljrn/Qq/8PQNuxYjJBi5TrnXU6i9XVYDrjwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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