SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7517815340bd2e751a7a800fd14072ba8c68b85ec4c4efb58959060c64580771' 
  AND token = 'iQ34ybzjF+mZpTM/D2LUCXquUbJ0GIVfSHzJF98Q80s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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