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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '040db12e7824c071c8987138141ec63d67458f1221899cdc8733618b1a1e6c89' 
  AND token = 'IvohETgHIDybCbt+zIYlhVAkMylp0rcRVAh31BpBM0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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