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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65d8b5da4ff468e48534f4dd42de5b7e02bc5b46983be0853574c445cbc34b6f' 
  AND token = 'N3a8a6DlCjcEv14ArFajYNkBIOic07HhODu4orLpIWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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