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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '830bc9053c5208b3212dc34a551c85c6a34609365c5522159a5f39a94d8b66b1' 
  AND token = 'nkVQhgk7Vn3rH1Sd+6X2Py0dCeFABYM15YTA6PRTtrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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