Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e751a840911684aa08d2004f56eabc0ea5994859f5557212bbb8b12014aee769' 
  AND token = 'brV3poq47L479uZaGSw+k7+X87upfvfFAts6F+AWXGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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