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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74b2d7030c0d02a1f1a5f81514c60e930539ce29d142f1eba0c0df3c265dcb22' 
  AND token = 'I3RQoZsHbAmHFS8zqTgaxenvRpQIkG6sS+VqCcaknQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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