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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e81157faf560b9e482d4cfa8de13faaded16c31fb13d1bb4b4152c0abbdbcf2c' 
  AND token = 'jbjKRa2PcRYGlqP2589QLULELj6XNDzofRe0WeVgVxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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