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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b3f3c442a323ce1b67a4ae1a34d293231ded4b7184fe1d4dabbf5c53b85b175' 
  AND token = 'mdGzTOtbKQiH8L8ZcE4yARYFb68tfd4tRbw8FrFvc+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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