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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f7b6b3de3974438f69d92c2adf8f71f9812ef504b51e6a5e71f1cab7c8f41fd' 
  AND token = '7JMPYjYpQMj2oRnXt9jDC0kj6Y2ET/cKpUGfWtt536o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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