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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6a8f78720a56ac53a258c58f28b779d085df2ba607c4a53a799729bd9b97df4' 
  AND token = 'Zwcxq8ZmOrwOC0XwzdtXV5tLLq3VoTPjsDIm6UTnL50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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