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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f0ba59f5e4809c63c28a92ff19151929f54c3bd820ba42259ddb0db39b6abb3' 
  AND token = 'I4cyL1HOq4RkaIz2aolwrlT9wAL7YYzvizuSXgXPM0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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