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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88ba10da5ebcea562701aa3afac8e69eda0c2de667b5a4ac5c924e405495a32e' 
  AND token = 'XxyPTRQp9pT0wwNtOERConLApdknyyILj+UnNdctYzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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