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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b8f83046b0f896564cc47ed6d7f340411db10f75f13117be0d6f2618d904c3f' 
  AND token = 'NWojDiiyTSl3DI0L+O4cA9CEq9ag/dyzWsQlF7qMV4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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