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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8bdc4700e54864aba000515001ddf33dfca698c2476bbf0432dd34c47604a45' 
  AND token = '0re46fxIshgkxkT4d0V19J5jhdz0oFzuoUnbZ39CjEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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