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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4d3c6a8e0e93d5cf9a0c0f1dbf81483111a213a6e64336c4555ea30f8de5101' 
  AND token = 'ICqKiYU/7X5lJTjO6186fh10En5SN4ctim7TEXKVtu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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