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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '198d6ef5c5ea0c94ad7adc3bcb7a5aca51fff0372a80b3391102d39e56c94bf5' 
  AND token = 'VB/Kedk8p2mtikfo1uoatqqF/PgBhL9ypceip6U72lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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