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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e47e38be7aa5f5eec715d9636c41c6a38f43134e556c658365bf608847dec251' 
  AND token = 'sOJZB9/Slfc6wq9O66RBO9kALi87+0X6Rx5/bPEc29A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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