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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61fa1dc149cba68519a975cd3b7ec06c9cab72d2b785b8a2c304db19eb25dd5d' 
  AND token = 'ZkpbLE0qmuYaQfiCuFdtCmEagtWAOWB7PzqrI92OSyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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