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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3892434ceb5ba3da4b21fc02883d3de367e025422d5bf511a67d0ce3258a39f6' 
  AND token = 'NbIffoCgW/PzlK634EgelIWqbb34CjMZJSH9m6KWmIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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