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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2511d2a381b3e375bb8f2f425fd92d1f3d6da97107dedd7f8bf1aa93008c73d' 
  AND token = 'AeBkzlSWawtw3QefiXZ3LpoNyYVzAP21QYDhckon/e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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