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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cf3cc4bfc4bfeb19d550c7cf1f6af2f0192adbe59c796cd8b6fe7cba2defa68' 
  AND token = 'amYE9N5u5FTo72IHHkcIxCIozKd6vPGRA+3nJj0Ov+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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