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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e6fed0bfffb4ba757f7a8eeeeaae8a2eda2b9081fd557b8cc494920aad0ab96' 
  AND token = 'SSTAv3OywMiWKahrGLP8q44vIIVYBi2NBtkQ015q6oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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