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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cd5be24b40d3123cbeaae60452946089499b0a362243af7ed6a17e388d4cc4d' 
  AND token = 'rjJ70J92XxNDeIt9tCMmoqyK5yejgJhUt5yuzjnYj8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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