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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34da6c838465fec8421b6f85712ae2aacdad35e8dcc0d93961c05a64baff8c0b' 
  AND token = '7k7DJDcaMRtVH5wqxt8iySKou3ogm61UPr+dvKaJixM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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