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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fff0dc8fa1c7f2015121d99be14bf7a76e0c07fe89709fabaea06b4196dbbf26' 
  AND token = 'wfps9gCQm18CCgGHCyI0AnoUJRqXfQzHg/3MUBo03tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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