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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99f39521dbd5425bae2c6d20cdc525a91cf2924ef09df9aee5cd69fa18642496' 
  AND token = '5cbISd4AwjeevQJFSIQsEo0S3nAaQrn2h/UuaO22SLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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