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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '434bdda7bb9b5f383aae7937107d0698419c39428fd00bc7f31b6839f669da1c' 
  AND token = '0s/EIuMcenNyJabj+fXfeo9DTG3DwK7CG8Ud9ZhmvtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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