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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96fe7b6d4b7ca406b2e8f068bc10ac1428427625bbb00584114d86dd25c687ca' 
  AND token = 'B++02yW6Tgr2C59OQG/ZfxmVEj3HbqYaTQ+WgyO6QrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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