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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6557efd10a5988b65f3bf35917008b65801df6ebeab9d5bfcfc5a6d9f7b135c' 
  AND token = 'vUsgZRNmROy29ZT20YafRXhbAn61y1rxIQOxlKgg5iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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