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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04a2fc2b1e24fdc9f707f076ebc5282756eadaa1b8345b3af717bcb6f3752c1e' 
  AND token = 'LH+80yGHSzDc4p8aahuIWasnUMxNTDMAizymi32xXH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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