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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ede6f0dc7156eaba01581a03e9ad6e30d63c9e5577c1a368a9bad5624043e9d2' 
  AND token = 'OUTj9cpoY0WfLGxszdZ3iLdIq1B2dMK+I+gzdGIBd6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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