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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a10dfa3f7cd81baac78aa9ca918f1d8298b3333ba7c7279925e3df6fc7f59dd' 
  AND token = '7qzQQdEuNdJ6YrkYOjAhuxKJGbeY4a9LcWZJiNq/NcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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