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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b06f5f4fa9c72a2cd3309808a24e8fc4e0174ffa1102b0c863bb955e576b81a4' 
  AND token = '9TbSGL02oWXdb+qH9kRT3RhB8uzVPxreR7hPz0046X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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