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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98cdbd30bc40afa9558a8839455ae1d1355fb9aed30a517830e0d1c5c56f9c9b' 
  AND token = 'oa0vJ1kzR0R+SxT6CNarrvhtAHtAdV70kFpKmHwGGHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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