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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6b5c6b343de14d9a407473135caa0eeecc4e1aedc7a9f2f0cef7f96e2bc9ff7' 
  AND token = 'xYuYBj/aJoLbaI+sgmEtDjezMj9gM0KNaPa94N34TbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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