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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0fc99058f3dab6c463f2f0254390e3644931d07f8b4dcaa9e931d043b8a1e70' 
  AND token = 'rcjxVOWhfNfWf3rGZLu4zzIS+O1tvXh78yl6a8aJUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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