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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bef355e1e9fd1b8b0c62236fe88241edccbe58e7457d2b0f1fa25355908a2fd7' 
  AND token = 'ak4h61Mz9v0o7RYLxeIGA0SpuU3YIWJ4USCn3zvLRng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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