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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '875eb6b315e521ae377a3130b0e178041c4e5b8d9b4a3dd77c1915dfd3ee0bfb' 
  AND token = 'A76oWjd0qptkVU6g1NJA27rGz/St+J1MGu2x6DP5FZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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