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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5840c7e0bb1ea2590f76d0cef7a41c5dbcbea7df1ab1119f96bf5c3a2717fbdc' 
  AND token = 'N9iMxDNAjegXEegaCp8LhBDoseDPD2Rr3xnc/P1De3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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