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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee43215070829a7c2d9e30832ee06cbda0a7610d1d94862582f0254447273a26' 
  AND token = 'pOV5svW2iFxRnoRKVV73lyPdglNSdLcRaOK0O8wWM+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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