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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceb78fc733afabd01e93a4b50fec3517f38b927e44a1d6de129697364d40b440' 
  AND token = 'rTTDRIpp4AeaOuItxXjgJ7KsFpGToKqz4jpLrsitolM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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