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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb08e3f263961ae3866947811ac02b3458cd9937b140e314c85e87905bd66624' 
  AND token = 'R2pAVw0yWjO55hyxvIg7dSKSloZ68Lycqg0MNXZF62I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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