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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9e5125bf63501b3cd945ccb26be2a78de10206ebd4cf30e5ca6a4d81e76a74e' 
  AND token = 'xDk2axqdiPiOjJpvMIdWy2xpvmpRdUvOd4WnIulu7KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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