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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3771daaaa168b10259094c6def154d83694d5f0ae8467ab74309244c2a80694' 
  AND token = 'neMwYcVPkDAMmTTmFryct5t+z64zHFw+OBmWc6fFsT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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