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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a79f86468d5532540ccf2012fd8ca1f79f51e75915feff83185cba8cd600b9c6' 
  AND token = 'chTi4Izv9QONsW7ylZaDTVMxjcQ0aTNZ1RVexxkVsVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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