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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6cfcfdaef84d29ea1555a4dd9d8897122a26cbd220454c51c2b8443701549e5' 
  AND token = '6eWvcqCKx6oHtajkydEwIVTfGxZpb9XbuCxdqqE4Z14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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