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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384bd28fee8b96eb99b024f3160f260ca115622edd06aad4ef869d13968741a4' 
  AND token = 'zddZJY7HuupIAdxIiQDdSR6jOb3DgKZD3srpOaF9sAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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