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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16c145c65703674391f1790805454082bab0f5705552ba9d051185757d0bc053' 
  AND token = 'P7QQ6PBUzH8HgqYnkoX3B4vM89yZecoH0N8RY6LNANM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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