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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8ac049d08d05413b2610caba9abd28989cef7c51d79cbbd30cdcbd0d7b30c8d' 
  AND token = 'ZjpeNZjrxLh58bN2cmVlZUY39azzoNAjIz5AVyUSkm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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