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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29a13d5f4e5e1d1eecaeae636dc13b857552c3aadc9a4e6fa498a8459d2ad868' 
  AND token = 'PV1YJRnI0vFgEFyUN1RnO9FIwrlISN7H+akBdLP9CkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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