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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cc71d24ac11f56d104a1b4b4da7f8a617fbf1274c5ce1575c42ceeb2d43908b' 
  AND token = 'bJdH9GKLGAhQVV8LLEA9SOnk4XvAyTVZMHAnMRSpz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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